8x4 Build based on plans by Joescnc Hybrid R&P

[GrahamWhite]

I'm finally looking at the motors and drivers and found this place -omc-stepperonline.com
in particular this driver
https://www.omc-stepperonline.com/st...or-dm860t.html
is that pretty much the same as the cnc4you one?
https://www.cnc4you.co.uk/Stepper-Mo...r-60VAC-CWD872
The stepperonline place don't do the 4Nm stepper though but they do have a 3Nm that pulls 4.2a as well as a 3Nm pulling 3.2a
They have nema 24 @4Nm would they fit my pinion plates ?
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read more so the 24's will fit ,they have the same mount hole spacing within .1mm
Agghhh - I know I need a Bob as well-one full of connectors or just a basic one, I have ordered a UC300eth for connecting to my pc so need 5v to power that- it that then an extra psu I need or can I pickup 5v from somewhere!

[JAZZCNC]

I'm finally looking at the motors and drivers and found this place -omc-stepperonline.com
in particular this driver
https://www.omc-stepperonline.com/st...or-dm860t.html
is that pretty much the same as the cnc4you one?

Yep pretty much and will work fine for your needs.

The stepperonline place don't do the 4Nm stepper though but they do have a 3Nm that pulls 4.2a as well as a 3Nm pulling 3.2a
They have nema 24 @4Nm would they fit my pinion plates ?

read more so the 24's will fit ,they have the same mount hole spacing within .1mm

When comes to motors whats more important is the inductance which is rated in mH. Lower the better and when wired Bi-polar parallel you want to be looking for around 2.5-3.5mH for best performance.

Be careful when comes to Nema sizes because some companys state Nema 23 which should = 56mm but the frame size is actually Nema 24 which =60mm. Prime example is that exact Cnc4you motor you linked to. The data sheet gives Dims of 60mm but they sell it as Nema 23.!!

Agghhh - I know I need a Bob as well-one full of connectors or just a basic one, I have ordered a UC300eth for connecting to my pc so need 5v to power that- it that then an extra psu I need or can I pickup 5v from somewhere!

Don't try to pick up 5V from else where like PC or USB. You need a stable 5V supply and ideally to lower risk of noise affecting controller you want it separate to any other devices.

Ideally you want to be getting away from 5V for things like E-stop, Limits etc because it's very susceptible to electrical noise which gives all sorts of weird and wonderful hair pulling mysterys.

Re- Bob's then you won't want to go the route I'd recommend because of price. Which would be UB1.
So in which case I'd say go with cheap Bob and just make sure it uses isolated Inputs. Most Simple Bob's don't have isolation so stay clear of those.

Highly recommend you draw up schematic and use 24Vdc safety circuit using relays. This will allow you to use 24Vdc to run thru E-stop and limit wires on the machine lowering any chance of false e-stops etc thru noise. The 5V signals you need for the Controller/BOB can then be kept to short wire runs and inside the control box which lowers chance of noise affecting machine.

Machine just relying on 5V for everything is very open to electrical Noise. Crazy things can occur.? ie: Mr's turns on hairdrier machine E-stops, Boiler fires up machine E-stops, Kettle on, Door bell etc etc.!!. . . think you get the picture. Anyone who's been affected by noise will tell you it's pain in the arse and only beat by resonance to which pulls the most hair.!